A new lignan, 4,4'-dihydroxy-3,3'-dimethoxy-6,9'-cycloligna-7,8'-dien-9'-al, was isolated from the stem of Syringa pinnatifolia Hems1. var. alashanensis MA. et S.Q. Zhou (S. pinnatifolia). This is the first report on the structure elucidation of a new compound based on spectroscopic methods including UV, IR, ESI-MS, 1D NMR and 2D NMR techniques.
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Wang et al. (2015) studied this question.
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